Abstract #2416

Acoustic Noise Reduction Using Digital Filters

JP Jordaan¹, Andre Van der Kouwe^1,2, Ali Alhamud^1,3,4, and Ernesta M. Meintjes^1,3

¹Department of Human Biology, University of Cape Town, Cape Town, South Africa, ²Athinoula A. Martinos Centre for Biomedical Imaging, Massachusetts General Hospital, Massachusetts, MA, United States, ³Cape Universities Body Imaging Centre (CUBIC-UCT), University of Cape Town, Cape Town, South Africa, ⁴MRI Research Unit, University of Tripoli, Tripoli, Libyan

We explored the use of digital low-pass filters to reduce the acoustic noise produced during DTI acquisitions, focusing mainly on the EPI readout. The filters attenuate the high-frequency harmonics of the gradient waveforms which results in reduced spectral content of the mechanical vibrations induced in the gradient coil assembly. Results showed a reduction of 2.9 dBA for peak sound pressure level (SPL) and 2 dBA for equivalent continuous sound level (L_eq) with no acquisition time penalty or reduction in image quality. The proposed method has the potential to be generalized to most gradient waveforms.

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